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Applied Physics Letters / Volume 92 / Issue 5 / DIELECTRICS AND FERROELECTRICITY

Appl. Phys. Lett. 92, 052902 (2008); http://dx.doi.org/10.1063/1.2841712 (3 pages)

Relaxor in KF-doped BaTi2O5 ceramics by spark plasma sintering

Jun Xu1 and Yukikuni Akishige2

1Research Project Promotion Institute, Shimane University, Matsue, Shimane 690-8504, Japan
2Faculty of Education, Shimane University, Matsue, Shimane 690-8504, Japan

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(Received 11 December 2007; accepted 19 January 2008; published online 6 February 2008)

Dense BaTi2O5 ceramics with KF doping up to 5 at. % were synthesized by spark plasma sintering (SPS). The SPS method enabled us to overcome the densifying difficulty in conventional sintering which is caused by the limit of the decomposing temperature of this metastable phase. We observed drastic KF-doping effect on the ferroelectric (FE) properties of BaTi2O5. Although there is only very small change in lattice parameters upon KF doping, the peak temperature in dielectric constant strongly decreases in an exponential way. The diffuseness of phase transition increases and FE relaxor state sets in for KF content as low as 1 at. %. Possible structural reasons for the effect and the implication for the nature of FE phase transition in BaTi2O5 are discussed.

© 2008 American Institute of Physics

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KEYWORDS and PACS

Keywords

barium compounds, doping, ferroelectric ceramics, ferroelectric transitions, lattice constants, permittivity, plasma materials processing, potassium compounds, relaxor ferroelectrics, sintering

PACS

  • 77.84.Ek

    Niobates and tantalates

  • 77.84.Cg

    PZT ceramics and other titanates

  • 77.80.B-

    Phase transitions and Curie point

  • 77.22.Ch

    Permittivity (dielectric function)

  • 81.05.Je

    Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)

  • 52.77.-j

    Plasma applications

  • 61.72.up

    Other materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2841712

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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